So here's one way I think the next chapter or two could go down:
Deku, and possibly someone else like Bakugou, go back to help All Might. Seeing All Might in such trouble, Deku probably won't be able to help himself, just as he has before. Deku will try and fight briefly alongside All Might, and will eventually resort to preparing 100+% power to beat AfO. However, due to his previous injury, this would mean sacrificing the use of his hands. All Might realizes this and tosses Deku aside, explaining that someone needs to be able to be the Pillar of Hope in the future and Deku needs to be able-bodied to do that. He realizes that he's going to die, but he sees loads of other heroes incoming (particularly Aizawa and Endeavor) and knows AfO will have to retreat so know one else will be hurt today. Finally, he looks out and sees the faces of some of his students (Momo and Deku are crying, maybe Iida or Kirishima too) and expresses his faith in the next generation. Then he goes in for one more attack to stall AfO a little further and dies with a smile on his face, giving him the moral victory.
The world loses a lot of faith in heroes, the students all grieve, Deku and possibly others have a big dose of survivor's guilt, and Bakugou learns that you don't always have to look cool to be a hero.